function preloadNav ()    {
      preload_image_object = new Image();
      // set image url
      image_url = new Array();
      image_url[0] = "http://littledesignplanet.co.uk/i/nav/globe-red.jpg";
      image_url[1] = "http://littledesignplanet.co.uk/i/nav/globe-grn.jpg";
      image_url[2] = "http://littledesignplanet.co.uk/i/nav/globe-blu.jpg";
      image_url[3] = "http://littledesignplanet.co.uk/i/nav/globe-yel.jpg";
	  image_url[4] = "http://littledesignplanet.co.uk/i/nav/globe-pnk.jpg";

       var i = 0;
       for(i=0; i<=4; i++) 
         preload_image_object.src = image_url[i];
    }



function navglobe(theme) {
	var navbg = document.getElementById('mainnav');
	var setTheme = "url('i/nav/"+theme+".jpg')";
	navbg.style.background=setTheme;
}